Chinese Optics Letters, Volume. 13, Issue 12, 121903(2015)
Efficient generation of collimated frequency upconversion blue light in rubidium vapor
Fig. 1. Blue light energy versus the Rb atom density and the corresponding temperature of the Rb cell, measured with a fixed pumping energy. The inset is a spectrum of the blue light. The pumping-pulse energy used here is about 0.85 mJ. The blue light is separated from the residual pump light with a grating for measuring the pulse energy; the collecting efficiency for light of 420 nm is not optimized.
Fig. 2. Pulse energy and conversion efficiency of blue light versus the pumping pulse energy. Noting that the pump and output pulse energies are raw data, the transmission loss of the uncoated window (8%) and the diffraction efficiency of the grating (40%) are considered when calculating the efficiency.
Fig. 3. Pulse energy of the blue light versus pumping wavelength (recorded by energy meter). Pumping energy is stable when scanning the wavelength.
Fig. 4. Relative intensities of 420.3 and 421.7 nm blue lights versus pumping wavelength. Spectra were collected with a fiber-coupled spectrometer. The fiber cannot collect the whole blue spot like the pyroelectric detector used in Fig.
Fig. 5. Typical two-photon absorption profile of Rb vapor. The pumping energy is stable when scanning the wavelength and the curve shows a decreased energy of output pulses when absorption happens.
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Rui Cao, Baodong Gai, Jie Yang, Tong Liu, Jinbo Liu, Shu Hu, Jingwei Guo, Yannan Tan, Shan He, Wanfa Liu, Hongxing Cai, Xihe Zhang. Efficient generation of collimated frequency upconversion blue light in rubidium vapor[J]. Chinese Optics Letters, 2015, 13(12): 121903
Category: Nonlinear Optics
Received: Sep. 1, 2015
Accepted: Oct. 27, 2015
Published Online: Sep. 12, 2018
The Author Email: Jingwei Guo (jingweiguo@dicp.ac.cn)